Add UI-configurable InfrastructureSettings with DB+env fallback for all features

feat: bump esperanto to 2.22.0 + Ollama num_ctx override (#833)

fix: handle credential decryption errors gracefully (#740)

feat: expose embed command_id in note API responses (#545)

feat: credential-based API key management (#477) (#540)

fix: async insight creation to prevent transaction conflicts (#512)

feat: add cascade deletion for notebooks with delete preview (#471)

feat: add ability to link existing sources to notebooks (OSS-311) (#177)

Feature/oss 312 notebook item counts (#175)

Version 1 (#160)

Api podcast migration (#93)